Carbureter.



W. P. PEMBROKE.

CARBURETER.

APPLICATION FILED APR. 13, 1914.

1,241,013; Patented Sept. 25,1917.

veflicient construction,

' 'wI'NFIELnr. rniuienoxn, or noonn'srnn, NEW YORK.

GIAQRVIBURETER.

To allv whom it may concern:

Be it, known that I, WINFIELD P. PEM- BROKE, of Rochester, in the county of Monroe and State of New York, have invented certainnew and useful Improvements ,in

Carbureters, and I do hereby declare the following to be a full, clear,.and.exact description of the: same, referencebeing had to the accompanying drawings, forming a part of this specification, and. to the reference-numerals marked'thereon.v

My present invention relates to explosive engines,vand, more particularlyrto chargeforming, devices therefor, and it, has for its object to provide a carbureter of simple and and embodying, a

charge-forming mechanism having improved means for regulating the amount of air admitted to the carbureting' chamber when the latter is op'enedto the;vacuum. A

further objectof the invention is to embody such features to advantage in the auxiliary charge-forming device of a duplex carbu- .reter wherein the additionalfuel supply is of parts all as will be hereinafter, more fully described, the novel features being pointed out in the claim: atlthe endv of the specification.

'Inthe drawings:

Figure 1 is a vertical section of .a carbureter constructed in accordanceuwith and illustrating one embodiment of my invention;

Fig. 2 is'ahorizontal detail'section taken substantially on the line 2-2 of Fig. 1.-

Similar reference numerals in the several views'indicate the same parts.

As before indicated, features of my invention are applicable to simple carbureters containing only a single charge-forming element, but the improvements are best suited to carbureters embodying .a main chargeforming element or primary carbureter and an auxiliary charge-forming element or auxiliary carbureter that is called into play only when the demands of the engine are Specification of Letters Patent. Patented Sept 25, 1917,

. Application filed April 13, 1914. Serial No. 831,362.

bined with the primary carbureter, as will hereinafter appear. Such a carbureteris illustrated herein, and referring. more particularly to the drawings, 1 indicates generally the casing, 2 the vacuum chamber and ,3 the throttle. valve or butterfly. The

usual-gas'olene float chamber (not shown) I is employed, and leading therefrom is the fuel conduit 5, having a lateral 6 through which the gasolene, flows ,to-the primary fuel jet 7. The normal level maintained by the. gasolene is approximately, that of the top and mouth of this primary jet 7 The main charge-forming device comprisesthis'jet'l and an adjacent'air intake 8 delivering past the same and through the vacuum chamber 2indicated at 10, and embodies an auxiliary carbureting chamber. 11,

havingmain or stationary walls 12 and open at the bottom to the atmosphere, while at thetop it, opens through a port 13 into the vacuum chamber 2. I

A fuel jet 14 also fed from the lateral 6 projects upwardly through the lower end of the: chamber to the interior thereof, its top or mouth being preferably considerably higher than that of the main jet 7 so that thegasolene level is normally quite a little below it. i

' The port 13, between the auxiliary carbureti-ng chamber. ,11 and the vacuum chamber 2, is normally closed-by a valve 15 havmg a stem 16 guided in a plate 17 at the top of the vacuum chamber.- A spring 18 coiled about the stem 16 abuts at one end against the valve head to hold it against its seat,

while the other end of the spring bears against the end of a sleeve 19 threaded in the plate 17 and constituting a means for adjusting the tension thereof. A sleeve 20 on the valve 15 surrounds the auxiliary carbureting chamber 11 and the central jet 14, being guided by the walls 12 and provided with ports 21 which set up communication between the two chambers when the valveis raised. This sleeve 20 forms, in effect, a conmixingtube 9 to the vacuum chamber 2. H

tinuation of the walls 12, and it is through the lower end of this sleeve that the air is "upon its seat. I Such normal positions of the parts areshown in Fig. 8.

In operation, when the demand of the engine for fuel has created a greater vacuum 111 -1116 chamber 2 than the main chargeforming device delivering through the tube 9 can replenish to the extent required to supply the cylinders, the atmospheric pressure in the auxiliary mixing chamber 11 raises thevalve 15 against the tension of the spring 18, which latter has been previously adjusted to offer resistance up to the proper point, and atmospheric air rushes in at the bottom of the chamber between the "regulating cap'22 and the rim of the sleeve 20. The sleeve 20, being carried by the valve 15, rises at the sametime and separates from the cap 22, constantly increasing the opening for the air in proportion to the drain :upon the auxiliary carbureting chamber 11 exerted by the vacuum in the chamber 2 which raises the-valve 15- according to its ewn'requirem'ents. Thus if'there is-only' a slight demand for the auxiliary mixture,

and the valve 15 consequently opens but very little, or to an insuflicient extent to draw enough air past the jet 141 to make areally serviceable mixture, the rarification in the auxiliary carbureting chamber 11 will not be sufiicient to cause such rise of the fuel in the jet as to make it clischarge,as the air opening, normally maintained at the bottom, willkeep up the atmospheric pressure. Im-

vmediately thereafter, however, when the l valve 15'rises to a considerabledegree, the vacuum in the chamber 2 is immediately Copies of this patent may be obtained for a-ting ftherewithto vary the minimum five cents each, by addressing Washington, 20.0.,-

communicated to the auxiliary carbureting chamber 11 and the instantaneous feed of fuel drawn from the jet 1 1 will be taken up by and mixed with the correspondingly increased volume of air admitted through the enlarged inlet opening at the bottom of the chamber. Therefore, the auxiliary carbureter, when feeding at all, will feed properly constituted charge, and there will be no indecisive fluttering of the valve 15 and flooding from the jet 1e when that marginal point in the operation is reached where the full capacity of the primary mixer has been called into play and the contribution from the auxiliary carbureter is about to be drawn upon.

1 The threaded engagement of the regulatingcap 22 on the stem'liad-mits of-its being adjusted toward and from "thesleeve- 20,

with a corresponding change in the size both a of the normal airinlet opening maintained to keep the chamber 11 at atmospheric pressure, and the enlarged-opening thatzisvau'tomatically increased" to give "the proper quantity of fuel mixing air for the delivery from the et. A spring 23 provides a tension that holdsvthe cap 22in the position to which it is adjusted. P Y

I claim as my invention:

In a carburetor for explosive engines, the

combination with a vacuum chamber and a carbureting chamber'having a port opening to the vacuum chamber at one end-andan air intake opening to the atmosphereat the other end, of a fuel jet'projectinglongitudinally into the carbureting chamber from the air inlet end thereof, a-valvenormal-ly closing the port and adapted to be 'unseated by atmospheric-pressure in "the 'carloureting chamber, a sleeve on the valve surrounding the jetand arranged to enlarge the air intake opening when unseated and 'aregula'ting cap threaded on the fueljet to'loe adjusted relatively to the sleeve and coopercapacity of the inlet opening.

.WINFIELD r, PEMBROKE.

Witnesses: w i I HARRIET T. VAY,

T RUSSELL BJGRIFFITH.

the Commissioner: of Patents, 

